/* ----------------------------------------------------------------------
* Copyright (C) 2010 ARM Limited. All rights reserved.
*
* $Date:        15. February 2012
* $Revision: 	V1.1.0
*
* Project: 	    CMSIS DSP Library
* Title:		arm_add_f32.c
*
* Description:	Floating-point vector addition.
*
* Target Processor: Cortex-M4/Cortex-M3/Cortex-M0
*
* Version 1.1.0 2012/02/15
*    Updated with more optimizations, bug fixes and minor API changes.
*
* Version 1.0.10 2011/7/15
*    Big Endian support added and Merged M0 and M3/M4 Source code.
*
* Version 1.0.3 2010/11/29
*    Re-organized the CMSIS folders and updated documentation.
*
* Version 1.0.2 2010/11/11
*    Documentation updated.
*
* Version 1.0.1 2010/10/05
*    Production release and review comments incorporated.
*
* Version 1.0.0 2010/09/20
*    Production release and review comments incorporated.
*
* Version 0.0.7  2010/06/10
*    Misra-C changes done
* ---------------------------------------------------------------------------- */

#include "arm_math.h"

/**
 * @ingroup groupMath
 */

/**
 * @defgroup BasicAdd Vector Addition
 *
 * Element-by-element addition of two vectors.
 *
 * <pre>
 *     pDst[n] = pSrcA[n] + pSrcB[n],   0 <= n < blockSize.
 * </pre>
 *
 * There are separate functions for floating-point, Q7, Q15, and Q31 data types.
 */

/**
 * @addtogroup BasicAdd
 * @{
 */

/**
 * @brief Floating-point vector addition.
 * @param[in]       *pSrcA points to the first input vector
 * @param[in]       *pSrcB points to the second input vector
 * @param[out]      *pDst points to the output vector
 * @param[in]       blockSize number of samples in each vector
 * @return none.
 */

void arm_add_f32(
    float32_t* pSrcA,
    float32_t* pSrcB,
    float32_t* pDst,
    uint32_t blockSize)
{
	uint32_t blkCnt;                               /* loop counter */

#ifndef ARM_MATH_CM0

	/* Run the below code for Cortex-M4 and Cortex-M3 */
	float32_t inA1, inA2, inA3, inA4;              /* temporary input variabels */
	float32_t inB1, inB2, inB3, inB4;              /* temporary input variables */

	/*loop Unrolling */
	blkCnt = blockSize >> 2u;

	/* First part of the processing with loop unrolling.  Compute 4 outputs at a time.
	 ** a second loop below computes the remaining 1 to 3 samples. */
	while(blkCnt > 0u) {
		/* C = A + B */
		/* Add and then store the results in the destination buffer. */

		/* read four inputs from sourceA and four inputs from sourceB */
		inA1 = *pSrcA;
		inB1 = *pSrcB;
		inA2 = *(pSrcA + 1);
		inB2 = *(pSrcB + 1);
		inA3 = *(pSrcA + 2);
		inB3 = *(pSrcB + 2);
		inA4 = *(pSrcA + 3);
		inB4 = *(pSrcB + 3);

		/* C = A + B */
		/* add and store result to destination */
		*pDst = inA1 + inB1;
		*(pDst + 1) = inA2 + inB2;
		*(pDst + 2) = inA3 + inB3;
		*(pDst + 3) = inA4 + inB4;

		/* update pointers to process next samples */
		pSrcA += 4u;
		pSrcB += 4u;
		pDst += 4u;


		/* Decrement the loop counter */
		blkCnt--;
	}

	/* If the blockSize is not a multiple of 4, compute any remaining output samples here.
	 ** No loop unrolling is used. */
	blkCnt = blockSize % 0x4u;

#else

	/* Run the below code for Cortex-M0 */

	/* Initialize blkCnt with number of samples */
	blkCnt = blockSize;

#endif /* #ifndef ARM_MATH_CM0 */

	while(blkCnt > 0u) {
		/* C = A + B */
		/* Add and then store the results in the destination buffer. */
		*pDst++ = (*pSrcA++) + (*pSrcB++);

		/* Decrement the loop counter */
		blkCnt--;
	}
}

/**
 * @} end of BasicAdd group
 */
